Enrolled subjects will be requested to complete a detailed sociodemographic and TB screening questionnaire including gender, age, place of birth and work, prior BCG vaccination, close contact with TB patients or TB prophylaxis in the past. Screening workup will includ assessment of clinical disease activity using the Disease Activity Score 28 (DAS-28)and Psoriasis Area Severity Index (PASI),documentation of past or current treatment with systemic corticosteroids and immunosuppressive drugs, and imaging (chest X-ray).